I (jfh@cs.brown.edu) have a C subroutine package that implements
(let the user beware) the programs that used to be used in the
HP41 Nav Pac. These include a nautical almanac program and a
basic sight-reduction software. This is the only free software I
know of. I also have a variation of the ``stars'' program that
uses the Yale Star Catalog to print a start chart, customized to
any day of the year, from any geographical position, at any
time. It comes with no documentation, though...

I have one which helps brush up on the tactics of racing. It's
available from

MFJ Enterprises Inc, Box 494, Miss. State, MS 39762, USA (phone
1-323-5869, fax 1-601-323-6551) have the MFJ-1278 ``Multi Mode
Data Controller''. It (with software) supports RTTY, CW, SSTV
and some other modes, along with fax of course. It is an external
unit and connects to your PC serial port. Last price I saw
was about $280. Software around $60.(la)

Ed Wallner's TIDES program is one of the simplest and best, and it's shareware!
Valid for as long as 200 years from now (albeit with some loss of accuracy).
TIDES can be downloaded from many bbs's, or:
Edwin P. Wallner; 32 Barney Hill Road; Wayland, MA 01778-3602;
508-358-7938 (pk).

Also you can get TIDES 3.02 by ftp to sunsite.unc.edu (pk).

Other Tides programs: tides202.zip is available for awhile on
ftp.ais.org in pub/jon. I haven't checked the accuracy yet, but it
appears to do what I want. (jz)

More Software: More prorams are available on the ship to shore bbs. (jz)